Illinois Route 31 Logo

The Illinois Route 31 Phase I project corridor is located in the Illinois Department of Transportation (IDOT) District 1 in McHenry County. The project begins at the intersection of Illinois Route 176 in Crystal Lake and extends north through the Village of Prairie Grove to Illinois Route 120 in downtown McHenry. The total project length is approximately 7.2 miles, and 0.4 miles along IL 31/IL 120.

Project Area Map